| | Yarrow Point, WA | West Covina, CA | United States |
| Population | 1,365 | 109,396 | 329,725,481 |
| Female Population | 50.2% | 51.5% | 50.5% |
| Male Population | 49.8% | 48.5% | 49.5% |
| Median Age | 44.3 | 39.5 | 38.4 |
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| Population - 2010 | 1,006 | 106,097 | 309,327,143 |
| Population - 2000 | 1,008 | 105,080 | 285,036,114 |
| Population - 1990 | 962 | 96,086 | 251,960,433 |
| Pop. 2000 to Now | 13.7% | -1.4% | 15.6% |
| Pop. 1990 to Now | 19.1% | 7.9% | 30.8% |
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| Population Density | 3,739.7 | 6,819.8 | 93.4 |
| Land Area | 0.4 | 16.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Yarrow Point, WA | West Covina, CA | United States |
| Age 0 to 4 | 3.9% | 5.3% | 5.9% |
| Age 5 to 9 | 8.8% | 5.7% | 6.1% |
| Age 10 to 14 | 8.1% | 6.0% | 6.6% |
| Age 15 to 17 | 6.3% | 3.2% | 3.9% |
| Age 18 to 20 | 0.7% | 3.5% | 4.0% |
| Age 21 to 24 | 2.1% | 5.7% | 5.2% |
| Age 25 to 34 | 7.0% | 15.1% | 13.8% |
| Age 35 to 44 | 14.7% | 12.0% | 12.9% |
| Age 45 to 54 | 17.9% | 13.4% | 12.6% |
| Age 55 to 59 | 12.0% | 7.3% | 6.7% |
| Age 60 to 64 | 3.2% | 6.3% | 6.3% |
| Age 65 to 74 | 7.1% | 9.3% | 9.6% |
| Age 75 to 84 | 5.1% | 4.7% | 4.5% |
| Age 85 and over | 3.0% | 2.5% | 1.9% |
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| Race | | | |
| | Yarrow Point, WA | West Covina, CA | United States |
| White | 65.0% | 10.6% | 59.4% |
| Black | 0.0% | 4.5% | 12.2% |
| Asian | 25.9% | 29.4% | 5.6% |
| Native American | 0.0% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.6% | 0.2% | 0.2% |
| Other | 0.4% | 0.5% | 0.4% |
| Two or More Races | 7.1% | 1.8% | 3.2% |
| Hispanic | 1.1% | 52.6% | 18.4% |
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| Marriage & Family | | | |
| | Yarrow Point, WA | West Covina, CA | United States |
| Married Population | 69.3% | 47.4% | 49.8% |
| Currently Married | 69.3% | 45.9% | 48.0% |
| Married but Separated | 0.0% | 1.5% | 1.8% |
| Single Population | 30.7% | 52.6% | 50.2% |
| Never Married | 19.3% | 37.8% | 33.8% |
| Divorced | 9.6% | 8.5% | 10.8% |
| Widowed | 1.8% | 6.3% | 5.6% |
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| Household Size | 3.01 | 3.42 | 2.60 |
| Households | 453 | 31,753 | 124,010,992 |
| Family Households | 398 | 25,161 | 80,755,759 |
| Married couple, w/children | 53.8% | 28.3% | 30.5% |
| Married couple, no children | 40.5% | 39.1% | 42.9% |
| Non Family Households | 55 | 6,592 | 43,255,233 |
| Single householder, w/children | 5.8% | 15.0% | 15.8% |
| Single householder, no children | 0.0% | 17.6% | 10.8% |